INVASION!

Stop the evil aliens from destroying your planet! If they hit you, you lose a life. If they hit the center of the planet, it's an instant game over. This game was heavily inspired by old arcade games, specifically Space Invaders. Try to score as high as you can and move up on the leaderboard. If someone can get to 10,000 points, I'd be impressed.

Controls:

Right - Move clockwise

Left - Move counter-clockwise

Up - Move away from center

Down - Move toward center

Space - Shoot

Tap the screen to enter touch mode. Press any key to go back to keyboard mode.

Scoring:

Block Enemy Shot - 10 pts

Kill Enemy - 50 pts + 10 pts for each step closer to the center

Kill Final Enemy - 100 pts + 20 pts for each step closer to the center

Finish Wave - Wave Number x 250 pts 

If the core is hit, each remaining life is worth 1,000 pts. You get an extra life at 3,600 pts.

Developer Note: This game was made in 3 hours for Trijam #376. The theme was "The Center of the Earth". I really like this idea however, so any feedback on how to improve the game would be great. Specifically, I would like to know whether the game has a good difficulty curve. I'd perfer the game be too difficult rather than too easy, as I think that's more interesting, but if it's too hard, let me know if I should tone it down (or up if it's too easy). Thanks for playing!